Junctions in rails do not update as intended when a redstone block is placed next to them, like in MC-98185. Updating them has no effect, either. One fix is to place another redstone block and then remove it. This is because the redstone blocks only update rails when removing them, not placing them. I suggest marking MC-98185 as related.
Related issues
duplicates
Comments
It happens when redstone devices that power other things on their own are placed next to rail junctions.
I don't really think this duplicates MC-98185, because that is about torches, and this is about redstone blocks. The behaviour does not occur with levers, pressure plates, etc..
If it happened with all redstone devices, then it would probably be a duplicate, but I don't really know if this is.